<template>
    <div class="app-container">
        <!-- 顶部 Header 区域 -->
        <mt-header fixed title="我的世界~Vue项目">
            <a slot="left" @click="goBack" v-show="flag">
                <mt-button icon="back">返回</mt-button>
            </a>
        </mt-header>

        <!-- 中间的路由 router-view 区域 -->
        <!-- keep-alive 组件缓存 -->
        <transition>
            <keep-alive>
                <router-view></router-view>
            </keep-alive>
        </transition>



        <!-- 底部 Tabbar 区域 -->
        <nav class="mui-bar mui-bar-tab">
            <router-link class="mui-tab-item-llb" to="/home">
                <span class="mui-icon mui-icon-home"></span>
                <span class="mui-tab-label">首页</span>
            </router-link>
            <router-link class="mui-tab-item-llb" to="/vip">
                <span class="mui-icon mui-icon-contact"></span>
                <span class="mui-tab-label">会员</span>
            </router-link>
            <router-link class="mui-tab-item-llb" to="/shopcar">
                <span class="mui-icon mui-icon-extra mui-icon-extra-cart">
                    <span class="mui-badge" id="badge">{{ this.$store.getters.getAllCount }}</span>
                </span>
                <span class="mui-tab-label">购物车</span>
            </router-link>
            <router-link class="mui-tab-item-llb" to="/search">
                <span class="mui-icon mui-icon-search"></span>
                <span class="mui-tab-label">搜索</span>
            </router-link>
        </nav>

    </div>
</template>

<script>
    export default {
        data(){
            return {
                flag: false
            }
        },
        created(){
            this.flag = this.$route.path === '/home'? false:true;
        },
        methods:{
            goBack(){ //点击后退
                this.$router.go(-1);
            }
        },
        watch:{
            '$route.path':function (newVal) {
                if(newVal === '/home'){
                    this.flag = false;
                }else{
                    this.flag = true
                }
            }
        }
    }
</script>

<style lang="less" scoped>
    .app-container{
        padding: 40px 0 50px 0;
        overflow-x: hidden; /* X轴溢出隐藏 */

        .mint-header{  /* 顶部 Header类 */
            z-index: 999;
        }
    }

    .v-enter{       /*切换 动画开始时 从右边往左进入*/
        opacity: 0;
        transform: translateX(100%);
    }
    .v-leave-to{    /*切换 动画结束时 往左边移出 */
        opacity: 0;
        position: absolute;
        transform: translateX(-100%);
    }
    .v-enter-active,
    .v-leave-active{
        transition: all 0.5s ease;
    }

    /* 改类名，解决 tabbar 点击无法切换的问题 */
    .mui-bar-tab .mui-tab-item-llb.mui-active {
        color: #007aff;
    }
    .mui-bar-tab .mui-tab-item-llb {
        display: table-cell;
        overflow: hidden;
        width: 1%;
        height: 50px;
        text-align: center;
        vertical-align: middle;
        white-space: nowrap;
        text-overflow: ellipsis;
        color: #929292;
    }
    .mui-bar-tab .mui-tab-item-llb .mui-icon {
        top: 3px;
        width: 24px;
        height: 24px;
        padding-top: 0;
        padding-bottom: 0;
    }
    .mui-bar-tab .mui-tab-item-llb .mui-icon ~ .mui-tab-label {
        font-size: 11px;
        display: block;
        overflow: hidden;
        text-overflow: ellipsis;
    }
</style>